Patent US3132810A successfully refreshed from Google Patents.
US3132810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic illumination device
Assignee: SCM Corp
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Filing: 1961-04-17
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Granted: 1964-05-12
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Expires: 1981-04-17
Abstract
No abstract record available.
Inventors
- 👤 Ralph G Ostensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:01
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/02; G03B27/14; G03B27/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
IN COMBINATION, A WEDGE-LIKE PRISM OF INTERNALLY REFLECTIVE LIGHT TRANSMITTING MATERIAL HAVING A LIGHT RECEIVING FIRST LATERAL FACE, PARALLEL SECOND AND THIRD LATERAL FACES INTERSECTING AND NORMAL TO SAID FIRST LATERAL FACE AND A FOURTH LATERAL FACE INTERSECTING SAID THIRD LATERAL FACE AT AN OBTUSE ANGEL, THE WIDTH OF SAID SECOND LATERAL FACE BEING GREATER THAN THE COMBINED WIDTH OF SAID THIRD AND FOURTH LATERAL FACES MEASURED PARALLEL TO SAID SECOND FACE, THE SURFACE OF SAID FOURTH LATERAL FACE BEING UNIFORMLY ROUGHENED AND THE SURFACES OF THE REMAINING LATERAL FACES BEING POLISHED, SAID SECOND AND THIRD LATERAL FACES BEING COVERED ADJACENT SAID FIRST LATERAL FACE WITH BANDS OF LIGHT ABSORBING MATERIAL, AND MEANS FOR INTRODUCING LIGHT RAYS INTO SAID PRISM THROUGH SAID FIRST FACE.
Claim 2
Dependent Claim
124 words
IN COMBINATION, A WEDGE-LIKE PRISM OF INTERNALLY REFLECTIVE LIGHT TRANSMITTING MATERIAL HAVING A LIGHT RECEIVING FIRST LATERAL FACE, PARALLEL SECOND AND THIRD LATERAL FACES INTERSECTING AND NORMAL TO SAID FIRST LATERAL FACE AND A FOURTH LATERAL FACE INTERSECTING SAID THIRD LATERAL FACE AT AN OBTUSE ANGEL, THE WIDTH OF SAID SECOND LATERAL FACE BEING GREATER THAN THE COMBINED WIDTH OF SAID THIRD AND FOURTH LATERAL FACES MEASURED PARALLEL TO SAID SECOND FACE, THE SURFACE OF SAID FOURTH LATERAL FACE BEING UNIFORMLY ROUGHENED AND THE SURFACES OF THE REMAINING LATERAL FACES BEING POLISHED, SAID SECOND AND THIRD LATERAL FACES BEING COVERED ADJACENT SAID FIRST LATERAL FACE WITH BANDS OF LIGHT ABSORBING MATERIAL, AND MEANS FOR INTRODUCING LIGHT RAYS INTO SAID PRISM THROUGH SAID FIRST FACE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-05-12 | 1967-11-11 | 1968-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-12 | 1971-11-11 | 1972-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-12 | 1975-11-11 | 1976-05-12 | $7700.00 | Window Closed / Lapsed |